2

4256B–USB–03/06

AT89C5132

Functional

Description

The AT89C5132 USB Bootloader facilitates In-System Programming (ISP) and In-Application

Programming.

In-System

Programming

Capability

In-System Programming allows the user to program or reprogram the microcontroller on-chip

Flash memory without removing it from the system and without the need of a pre-programmed

application.

The USB bootloader can manage a communication with a host through the USB bus. It can also

access and perform requested operations on the on-chip Flash memory.

In-Application

Programming or

Self- Programming

Capability

IAP allows the reprogramming of the microcontroller on-chip Flash memory without removing it

from the system and while the embedded application is running.

The USB bootloader contains some Application Programming Interface routines named API rou-

tines allowing IAP by using the user’s firmware.

Block Diagram

This section describes the different parts of the USB bootloader. Figure 1 shows the on-chip

bootloader and IAP processes.

Figure 1. Bootloader Process Description

ISP Communication

Management

User

Application

USB Protocol

Communication

Management

Flash

Memory

External host via the

Flash Memory

IAP

Management

User Call

On-chip